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Management of Switchgrass-Dominated Conservation Reserve Program Lands for Biomass Production in South Dakota

^a 7049 Grayson Turnpike, Speedwell, VA 24374
^b Plant Science Dep., South Dakota State University, 247 NPB, Box 2140-C, Brookings, SD 57007-2141

View larger version (37K): [in a new window]   Fig. 1. Harvest timing x harvest year interaction for total yield (TY) and switchgrass yield (Swg) at anthesis (An) and killing-frost (KF) harvests at three locations in South Dakota. Values are averaged across N rate. Fisher's protected LSD(0.05) values, to compare across harvest timing and harvest year, are shown above the respective bars for TY and Swg yield for each location. NS = not significant at 0.05 level of probability.

View larger version (46K): [in a new window]   Fig. 2. Nitrogen rate effect on total yield (TY), and switchgrass yield (Swg) at three locations in South Dakota. Values are averaged across harvest timing and harvest year. Fisher's protected LSD(0.05) values, to compare across N rate are shown above the respective bars for TY and Swg yield for each location. NS = not significant at 0.05 level of probability.

View larger version (29K): [in a new window]   Fig. 3. Harvest timing effect on switchgrass (Swg), grassy weeds (GW), broadleaf weeds (BW), senesced material (SM), and miscellaneous (Misc.) percentage at three locations in South Dakota, and sweetclover (SC) for Location 2. Values are averaged across N rate and harvest year. Fisher's protected LSD(0.05) values, to compare across harvest timing are shown above the respective bars for each component for each location. NS = not significant at 0.05 level of probability.

View larger version (29K): [in a new window]   Fig. 4. Harvest year effect on switchgrass (Swg), grassy weeds (GW), broadleaf weeds (BW), senesced material (SM), and miscellaneous (Misc.) percentage for three locations in South Dakota, and sweetclover (SC) for Location 2. Values are averaged across N rate and harvest timing. Fisher's protected LSD(0.05) values, to compare across harvest year, are shown above the respective bars for each component for each location. NS = not significant at 0.05 level of probability.

View larger version (47K): [in a new window]   Fig. 5. Nitrogen rate x harvest year interaction for total nitrogen (TN) concentration from biomass harvested from three locations in South Dakota. Values are averaged across harvest timing. Fisher's protected LSD(0.05) values, to compare across N rate and harvest years, are shown above the respective bars for each location. NS = not significant at 0.05 level of probability.